Method and die for thinning microstructure of magnesium alloy material through continuous chill casting, squeezing and cutting

Abstract

The invention provides a method and a die for thinning the microstructure of a magnesium alloy material through continuous chill casting, squeezing and cutting. A liquid-stage magnesium alloy is used as a raw material; a water-cooled squeezing die with a chill water jacket arranged outside is used as a crystallizer; and molten metal in the die is cooled and solidified in the water-cooled crystallizer at a sub-high speed, then is in a solid state or a semisolid state, and bears an external force for continuous squeezing and cutting so as to prepare a magnesium alloy bar (sectional material). By the method, the defects of shrinkage cavities and looseness in a magnetic alloy cast structure are overcome, the microstructure and the mechanical properties of a part can be improved, a thinned surface fine crystalline structure is obtained, and the production cost and the tonnage of molding equipment can be reduced; and the thinned microstructure of the magnesium alloy material has the characteristics of sub-high speed solidification and plastic deformation under the action of three-direction squeezing pressures and continuous cutting, and can be used for producing difficultly-deformable alloy bars (sectional materials), and the mechanical properties are improved. The method can also be used for recovering magnesium-aluminum alloys, so that magnesium-aluminum alloy materials are reused.

Description

technical field [0001] The invention relates to a non-ferrous metal plastic forming technology, the preparation of high-strength and toughness magnesium alloy or other alloy fine-grained materials and the production of profiles; in particular, it relates to a method and a mold for continuous chilled casting, extrusion and shearing to refine the microstructure of magnesium alloy materials. [0002] Background technique [0003] Magnesium alloy is the lightest metal material for engineering structures. It has the characteristics of low density, high specific strength, good electrical conductivity and electromagnetic shielding performance, good vibration reduction and damping performance, and easy recycling; magnesium alloy is widely used in portable In the equipment and automobile industries, to achieve the purpose of lightweight. Magnesium alloys can be used in automobiles, aerospace, and 3C products (household appliances, computers, communication electronic devices) and oth...

AI Technical Summary

Problems solved by technology

However, due to the limitations of many such methods, the effect of refining grains needs to be improved, and the effect of refining the microstructure of magnesium alloy materials and improving the uniformity of magnesium alloy structures is not obvious.

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